The father of three did not know he had been cleared of any wrongdoing by GSOC.
The ombudsman was investigating the death of Sheena Stewart, who was struck by a taxi in Ballyshannon, Co. Donegal on New Year's Day.
Sergeant Galvin said he had seen her on the footpath, but CCTV footage showed Ms Stewart on the road, beside the footpath.
The Association of Garda Sergeants and Inspectors wants an independent investigation into how such an anomaly could've resulted in a criminal investigation into their member.
Solicitor Michael Hegarty says there was never any allegation of wrongdoing: